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WO2018034069A1 - Procédé de fabrication de feuille étirable - Google Patents

Procédé de fabrication de feuille étirable Download PDF

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Publication number
WO2018034069A1
WO2018034069A1 PCT/JP2017/024416 JP2017024416W WO2018034069A1 WO 2018034069 A1 WO2018034069 A1 WO 2018034069A1 JP 2017024416 W JP2017024416 W JP 2017024416W WO 2018034069 A1 WO2018034069 A1 WO 2018034069A1
Authority
WO
WIPO (PCT)
Prior art keywords
elastic film
roll
sheet
sheet layer
elastic
Prior art date
Application number
PCT/JP2017/024416
Other languages
English (en)
Japanese (ja)
Inventor
竹内　寅成
Original Assignee
大王製紙株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 大王製紙株式会社 filed Critical 大王製紙株式会社
Priority to US16/324,287 priority Critical patent/US10869784B2/en
Priority to EP17841297.9A priority patent/EP3501802B1/fr
Publication of WO2018034069A1 publication Critical patent/WO2018034069A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F13/15585—Apparatus or processes for manufacturing of babies' napkins, e.g. diapers
    • A61F13/15593—Apparatus or processes for manufacturing of babies' napkins, e.g. diapers having elastic ribbons fixed thereto; Devices for applying the ribbons
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A—HUMAN NECESSITIES
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    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
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    • A61F13/15699—Forming webs by bringing together several webs, e.g. by laminating or folding several webs, with or without additional treatment of the webs
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    • A61F13/15577—Apparatus or processes for manufacturing
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    • A61F5/4404—Details or parts
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    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
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    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
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    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/344—Stretching or tensioning the joint area during joining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/433—Casing-in, i.e. enclosing an element between two sheets by an outlined seam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
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    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
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    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/729—Textile or other fibrous material made from plastics
    • B29C66/7294—Non woven mats, e.g. felt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/731—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the intensive physical properties of the material of the parts to be joined
    • B29C66/7311—Thermal properties
    • B29C66/73115—Melting point
    • B29C66/73116—Melting point of different melting point, i.e. the melting point of one of the parts to be joined being different from the melting point of the other part
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83415—Roller, cylinder or drum types the contact angle between said rollers, cylinders or drums and said parts to be joined being a non-zero angle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0088—Blends of polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0046—Elastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/48—Wearing apparel
    • B29L2031/4871—Underwear
    • B29L2031/4878—Diapers, napkins

Definitions

  • the present invention relates to a method for producing a stretchable sheet in which a first sheet layer and a second sheet layer sandwich an elastic film.
  • an absorbent article for example, a disposable diaper
  • stretchability in order to improve fit to the body surface, it is common to impart stretchability to appropriate places such as around the legs and around the trunk.
  • a method for imparting stretchability conventionally, a method of fixing an elongated elastic stretchable member such as rubber thread in a stretched state in the longitudinal direction has been widely adopted, but it is desired to impart stretchability to a certain width. In such a case, a mode is adopted in which the rubber thread is fixed in a state of being arranged side by side with an interval in the width direction.
  • an elastic sheet having a structure of nonwoven fabric / elastomer film / nonwoven fabric has been proposed as a material that gives a stretchability by pressing on a surface stripe instead of a plurality of thread rubbers arranged in parallel.
  • Patent Document 1 Japanese Patent Document 1
  • Patent Document 1 in addition to a non-porous form in which holes are not formed in the entire first outer layer, second outer layer, and elastic film (elastomer), holes that penetrate the first outer layer, the second outer layer, and the entire elastic film are formed.
  • the form of the holes is also disclosed.
  • the perforated form of Patent Document 1 supplies an elastic film that expands and contracts in the continuous machine direction (MD) having a higher melting point or no melting point between the first outer layer and the second outer layer, The first outer layer and the second outer layer are directly bonded to each other at a predetermined position by welding, and then, by applying a pulling force in the CD direction, the first outer layer, the elastic film, and the entire second outer layer are penetrated through the bonding site. A through hole is formed to ensure air permeability.
  • MD continuous machine direction
  • Patent Document 2 discloses a method in which a plurality of stretching rolls are provided and stretching is performed in the process of circulating these stretching rolls. This method has been examined for “necking”, and is intended to suppress “necking” (neck-in) by shortening the distance between the drawing rolls, but is not considered to be sufficiently effective.
  • the main problem of the present invention is to provide a method for producing an elastic sheet capable of suppressing neck-in.
  • the present invention that has solved the above problems is as follows.
  • the method for producing the stretchable elastic sheet of the present invention is as follows.
  • the elastic film is interposed between the first sheet layer and the second sheet layer in a stretched state, and heat is applied from outside the first sheet layer and the second sheet layer.
  • Thermal melting energy is applied to a large number of joint regions spaced apart by a melting device, the elastic film is melted, and the first sheet layer and the second sheet layer are joined directly or via an elastic film to a large number of joint portions.
  • the thermal melting apparatus has an anvil roll and an ultrasonic horn, and the anvil roll has a large number of protrusions spaced on the outer surface in the roll length direction and the outer circumferential direction.
  • An opposing roll is disposed apart from the anvil roll, A nip roll that nips the elastic film is disposed corresponding to the opposing roll, The elastic film passes through the nip position between the opposing roll and the nip roll and goes around the opposing roll, and then goes around the anvil roll so that the peripheral speed of the anvil roll is faster than the peripheral speed of the opposing roll. In this way, the elastic film is stretched and bonded by the group of protrusions of the anvil roll and the ultrasonic horn.
  • a through hole can be formed at least at the boundary portion between the elastic film and the joining portion in the machine direction. The reason why the through hole is formed will be described in detail later.
  • the thermal melting apparatus is a means that has an anvil roll and an ultrasonic horn and melts at least a part of at least one of the first sheet, the second sheet layer, and the elastic film by the applied energy.
  • a counter roll is disposed apart from the anvil roll, and a nip roll for nipping the elastic film is disposed corresponding to the counter roll.
  • the elastic film passes through the nip position between the opposing roll and the nip roll and goes around the opposing roll, and then goes around the anvil roll so that the peripheral speed of the anvil roll is faster than the peripheral speed of the opposing roll. Thereby stretching the elastic film. That is, since the elastic film is nipped between the opposing roll and the nip roll, the elastic film is substantially stretched (stretched) from the nip position by making the peripheral speed of the anvil roll faster than the peripheral speed of the nip roll. ) Is started. Furthermore, since the elastic film goes around the anvil roll after going around the opposing roll, it is considered that the resistance between the roll surfaces also suppresses the neck-in.
  • the resistance force between at least the surface of the opposing roll of the elastic film becomes stronger and contributes to the suppression of neck-in.
  • the extension starts from the nip position, or the extension exceeding 50% of the required extension rate starts from the nip position.
  • the distance between the nip position and the joining position is less than 250 mm. 30 mm to 200 mm is particularly desirable.
  • the elastic film is separated from the anvil roll at a distance of 10 mm or less downstream of the joining position after passing through the joining position. It can be said that the distance is desirably less than 260 mm.
  • the anvil roll is preferably a crown roll rather than a flat roll.
  • a crown roll it is considered that the resistance force of the elastic film between the crown roll surface and the neck roll-in contributes to suppression.
  • An example of the arrangement of the joints is a staggered pattern.
  • the protrusion area ratio occupied by the total area of the group of protrusions included in a unit area is different at least in the roll length. desirable.
  • a through hole can be formed at least at the boundary portion between the elastic film and the joining portion in the machine direction.
  • joint portion of the present invention there are the following joint form examples.
  • (1) The first sheet layer and the second sheet layer are partially melted and joined to the elastic film, that is, the first sheet layer and the second sheet layer are joined via the elastic film.
  • the difference in elastic film strength occurs between the joined part and the non-joined part. Therefore, after the stretched state of the stretch sheet holding the extension is once released and contracted to obtain a product; or after the stretch sheet holding the stretch is combined with another member, the stretched state is once released and contracted.
  • the product is stretched mechanically or manually in the expansion / contraction direction, breakage occurs at the boundary between the joined portion and the non-joined portion. As a result, a through hole is formed.
  • the through holes do not need to be formed in all the joints, and exhibit air permeability even if formed in some of the joints.
  • the through hole has a shape extending in the machine direction from the edge of the joint.
  • the through hole has a shape extending in both directions from the edge of the joint, and in some cases around the joint May have an annular shape.
  • the elastic film of the present invention generally uses an elastomer, it can expand and contract in the machine direction (MD) and the orthogonal direction (CD).
  • the joining portion is provided with a longer length in the orthogonal direction (width direction: CD) than the machine direction (MD) length.
  • the elastic film preferably has a melting point of about 80 to 145 ° C.
  • the first sheet layer and the second sheet layer have a melting point of about 85 to 190 ° C., particularly about 130 to 190 ° C.
  • the difference between the melting points of the first sheet layer and the second sheet layer and the melting point of the elastic film 30 having a lower melting point is preferably about 50 to 80 ° C.
  • the melting point of the elastic film is 95 to 125 ° C.
  • the melting point of the first sheet layer is more than 125 ° C. to 160 ° C., more preferably 130 to 160 ° C.
  • the melting point of the second sheet layer is 125. More than 160 ° C. to 160 ° C., more preferably 130 to 160 ° C.
  • the protrusion area ratio occupied by the total area of the protrusion groups included in the unit area is at least different from the roll length.
  • the protrusion corresponds to the joint.
  • the area of the joint is 0.14 to 3.5 mm 2.
  • the area ratio of the joint is preferably 1.8 to 22.5%.
  • the area ratio of the joint in the stretchable region is 1.8 to 22.5%.
  • the “area ratio” means the ratio of the target portion to the unit area, and the total area of the target portion (for example, joints and openings of through holes) in the target region (for example, the stretchable region) is the area of the target region.
  • the “joint area ratio” means the area ratio in a state of being stretched to the elastic limit in the stretching direction.
  • the area of the opening of the through hole in the natural length state of the stretchable sheet is preferably more than 1 to 1.5 times the area of the joint.
  • the area of the opening of the through hole means the value when the stretchable structure is in a natural length state, and is the minimum value when the area of the opening of the through hole is not uniform in the thickness direction, such as different between the front and back of the elastic film.
  • the joint area ratio in the present specification can be selected by selecting the size, shape, separation interval, arrangement pattern in the roll length direction and roll circumferential direction, etc. of the protrusions of the anvil roll described later.
  • the “elongation stress” to be described later is a tensile test in which the initial chuck interval (distance between marked lines) is 50 mm and the tensile speed is 300 mm / min according to JIS K7127: 1999 “Plastics—Testing method of tensile properties”. Means “stress when stretched to 50% of elastic limit (N / 35 mm)”. When a test piece having a width of 35 mm cannot be cut out, the test piece is created with a width that can be cut out, and the measured value is set to a value converted into a width of 35 mm. If the target area is small and sufficient specimens cannot be collected, a comparatively small specimen can be compared at least if it is a comparison of stretching stress.
  • the present invention is a method for manufacturing an elastic sheet that can suppress neck-in and reduce material costs.
  • the elastic sheet of the present invention can be used for absorbent articles that absorb and retain body fluids such as disposable diapers, sanitary napkins, and absorbent pads.
  • the stretchable sheet is formed between the first sheet layer 21 made of, for example, a non-woven fabric that does not have stretchability, and the second sheet layer 22 made of, for example, a non-woven fabric that does not have stretchability.
  • the elastic film 30 that can be expanded and contracted in the front-rear direction is laminated, and the first sheet layer 21 and the second sheet layer 22 are directly or via the elastic film 30 with a large number of joints 40 spaced apart from each other. Are joined together.
  • “the first sheet layer 21 and the second sheet layer 22 are not stretchable” does not mean that the first sheet layer 21 and the second sheet layer 22 are not stretched at all. It means not.
  • Opposite roll 63 is arranged to face the anvil roll 60.
  • the opposing roll 63 is provided with a nip roll 65 that nips the elastic film 30. It rotates so that the peripheral speed of the anvil roll 60 may become faster than the peripheral speed of the opposing roll 63 and the nip roll 65.
  • the outer periphery of the opposing roll 63 is circulated, and thereafter the anvil roll 60 is circulated.
  • the elastic film 30 is stretched by making the peripheral speed of the driving and rotating anvil roll 60 faster than the peripheral speed of the opposing roll 63 and the nip roll 65, and the group of protrusions 60 a of the anvil roll 60 and ultrasonic waves are extended. Joining is performed with the horn 61.
  • the elongation rate in the manufacturing process of the elastic film 30 (when the length of the natural state is 100% as a reference) Can be set.
  • the anvil roll 60 and the facing roll 63 are arranged close to each other, although the elastic film 30 is not niped. Then, the elastic film 30 goes around the opposing roll 63 with a holding angle ⁇ of more than 90 degrees and less than 180 degrees with respect to the opposing roll 63.
  • the holding angle ⁇ is approximately 90 degrees from the nip position with the nip roll 65.
  • the elastic film 30 and the second sheet layer 22 wrap around the anvil roll 60 with a holding angle ⁇ of about 90 degrees.
  • positioning of the anvil roll 60, the opposing roll 63, and the nip roll 65 can be selected suitably.
  • the anvil roll 60 and the facing roll 63 are arranged slightly apart from each other without the nip of the elastic film 30.
  • the elastic film 30 is not in contact with the opposing roll 63 until reaching the position of the nip roll 65.
  • the elastic film 30 goes around the opposing roll 63 with a holding angle ⁇ of less than 90 degrees with respect to the opposing roll 63.
  • the elastic film 30 and the second sheet layer 22 wrap around the anvil roll 60 with a holding angle ⁇ of less than 90 degrees.
  • the distance from the separation position where the elastic film 30 is separated from the opposing roll 63 to the position where the elastic film 30 starts to be held on the anvil roll 60 is 50 mm or less, preferably 10 mm or less, particularly 5 mm or less in order to suppress neck-in.
  • the anvil roll 60 and the opposing roll 63 are arranged close to each other, although the elastic film 30 is not nipped. And the nip roll 65 is arrange
  • the elastic film 30 starts to be stretched (stretched) from the nip position between the opposing roll 63 and the nip roll 65, and is shown as a fourth bonding example.
  • the elastic film 30 is nipped between the pre-roll 62 and the pre-nip roll 64, and the elastic film 30 is nipped between the opposing roll 63 and the nip roll 65.
  • two-stage elongation is possible.
  • FIG. 13 shows the result of examining the relationship between the separation distance from the nip position to the joining position and the neck-in rate.
  • the neck-in rate does not increase in direct proportion to the distance between the stretching rolls, but suddenly increases when the distance between the stretching rolls is 250 mm or more. Therefore, in the example shown in FIG. 9, the distance from the nip position between the opposing roll 63 and the nip roll 65 of the elastic film 30 to the joining position of the anvil roll 60 is preferably 250 mm or less. In particular, it is desirable that it is 180 mm or less.
  • the holding angle ⁇ from the nip position of the elastic film 30 to the position where the elastic film 30 moves away from the opposing roll 63 is 300 degrees to 30 degrees (more desirably 120 degrees to 45 degrees), and neck-in is suppressed. Desirable for.
  • the holding angle ⁇ of the anvil roll 60 is preferably 270 ° to 30 ° (more preferably 120 ° to 45 °) for neck-in suppression.
  • stepwise stretching stretching
  • single-stage stretching stretching
  • the separation distance from the nip position to the joining position becomes longer, which is not preferable.
  • One-stage stretching (stretching) as in the first to third joining examples is desirable, and it is desirable not to stretch the elastic film upstream from the nip position.
  • the anvil roll 60 is preferably a crown roll as shown in FIG.
  • the length of the anvil roll 60 is desirably about 1000 mm.
  • the crown amount can be selected as appropriate, but if necessary, the crown amount can be adjusted by cooling the roll end.
  • the protrusions 60a of the anvil roll 60 can be formed so as to be denser toward the center of the roll length. With this form, the center part is most thermally expanded and is likely to be crowned.
  • the quenching hardness is optimally 60 to 61 in HRC.
  • FIG. 6 schematically shows a cross section of the stretchable sheet after joining in the stretched state (however, no through-hole has been formed yet).
  • the stretchable sheet contracts due to the contraction force of the elastic film 30, and can be expanded when an external force is applied. Therefore, when the expansion / contraction direction of this stretchable sheet is matched with, for example, the front / rear direction of the disposable diaper, the disposable diaper can be expanded / contracted in the front / rear direction.
  • the expansion / contraction direction is made to coincide with the width direction of the disposable diaper, the disposable diaper can expand / contract in the waist or waist direction.
  • the stretchable sheet obtained by cutting the web of the stretchable sheet and then cutting it to a desired area can be applied to a predetermined part of the product.
  • conventional disposable diapers it is generally performed by fixing a plurality of thread rubbers in parallel to the sheet, but this reduces quality due to deterioration of thread rubber and hot melt adhesive for fixing to the sheet, In addition, it is inferior in terms of stable productivity during production.
  • the first sheet layer 21 and the second sheet layer 22 are joined by melting the elastic film 30.
  • the bonding mode between the layers is not limited to these examples.
  • the first sheet layer 21 and the second sheet layer 22 are joined directly, that is, without interposing an elastic film.
  • the above aspects (1) to (3) are cases where the melting point of the elastic film 30 is lower than the melting points of the first sheet layer 21 and the second sheet layer 22, but the melting point of the elastic film 30 is the first sheet layer. 21 and / or higher than the melting point of the second sheet layer 22.
  • the elastic film 30 side surface portion of the first sheet layer 21 and / or the second sheet layer 22 is activated or melted and joined to the elastic film 30.
  • the elastic film 30 may be partly melted, and the first sheet layer 21 and / or the second sheet layer 22 may be joined by melting.
  • the 1st sheet layer 21 and / or the 2nd sheet layer 22 are nonwoven fabrics, and the fiber may have a core-sheath structure. In this case, for example, only the sheath component of the fiber can be melted and contribute to the joining.
  • the shape, size and arrangement of the joints are uniform, and the ratio of the total area of the joints included in the unit area of the region to the unit area, that is, the joint area ratio You can choose.
  • FIG. 1 is a plan view of an example of an arrangement pattern of joints (approximate to an arrangement pattern of protrusions when the anvil roll is viewed in a developed state).
  • the unit area S in this case is desirably set to a size that includes at least 10 joints (it is difficult to compare the stretching stress with a small number).
  • 13 joint portions are included.
  • the external shape which defines unit area S may be other shapes, such as a rectangle and a circle, besides a square.
  • An example of the joint 40 is a circle shown in FIG.
  • Lm is an arrangement interval length in the machine direction
  • Lc is an arrangement interval length in an orthogonal direction (cross direction: CD) orthogonal to the machine direction
  • Pm is a machine direction
  • pitch length of MD and Pc is an orthogonal direction (cross direction)
  • CD pitch length
  • the expansion stress is in the relationship of A> B by setting the joint area ratio to A ⁇ B.
  • the case A when the pitch length Pm and the pitch length Pc are long and A is compared with the case B when the pitch length Pm and the pitch length Pc are short, the case A (when the joint area ratio is low) is long.
  • the pitch length Pm ⁇ Pc when the pitch length Pm ⁇ Pc is short, the elongation ratio is larger than that in B (when the joint area ratio is high).
  • the stretching stress has a relationship of A> B.
  • the form of FIG. 2 differs in the extensional stress in the lateral direction of FIG.
  • the B region having a small expansion and contraction stress is arranged before and after the intermediate region A in the front-rear direction.
  • the front and rear B regions and the B region can correspond to, for example, front and rear end portions of the disposable diaper. Since the stretching stress is small at the front and rear end portions, the shape stability is good. It becomes easy to attach to.
  • the difference in the joint area ratio can be achieved by changing the joint area in addition to the density of the arrangement pattern.
  • FIG. 4 shows an example in which a large number of small junctions are arranged in the region C so as to have the same junction area as the region D.
  • the elastic film Physical properties such as thickness, material, strain / stress characteristics, melting point, etc. of the elastic film can be selected as appropriate. By selecting the relationship between this elastic film, the ultrasonic melting energy applied thereto, and the elongation rate of the elastic film at the time of manufacturing the stretchable sheet, as shown in FIG. 31 can be formed.
  • the first sheet layer 21 and the second sheet layer 22 are formed of, for example, a nonwoven fabric, the nonwoven fabric exhibits air permeability. Therefore, for example, when used as an outer sheet or an outer sheet of a disposable diaper, the air permeability is good.
  • the reason why the ventilation through hole 31 is formed is not necessarily clear, but the elastic film 30 is melted by the ultrasonic melting energy, and the connecting portion 40 is thinned by the pressing by the protrusion 60 a of the anvil roll 60. At this time, the elastic film 30 is also thinned, the peripheral portion of the joint portion 40 reaches the breaking strength, the breakage is started by the stretching stress acting on the stretched elastic film 3, shrinks to the balance point, and opens. it is conceivable that.
  • FIG. 15 schematically shows an example of forming the through hole 31 in the joint 40 generated in the case of the circular protrusion 60a.
  • a substantially crescent-shaped through hole 31 is formed on both sides of the connecting portion 40 in the machine direction (extension direction).
  • the connecting portion can have a long shape in a direction (cross direction: CD) orthogonal to the extension direction (machine direction: MD).
  • cross direction: CD cross direction
  • MD machine direction
  • the through holes 31 it is not essential for the through holes 31 to be formed in all the coupling portions. If it is required to reliably form the through hole 31 or make a large hole, the method shown in FIG. 15 can be adopted. That is, as shown in FIG. 17B, the stretchable sheet in which the coupling portion 40 is formed is passed between a pair of rolls 64 having ridges or projections 64a, and between the adjacent projections 64a and 64a.
  • the through-hole 31 can be formed by biting the protrusion 64a of the other roll 64 and applying a deformation force to the stretchable sheet.
  • each joint part 40 and the through-hole 31 is arbitrary, such as a perfect circle, an ellipse, polygons, such as a rectangle (including a linear or rounded thing), a star shape, a cloud shape, etc. It can be made into the shape.
  • the size of each joint 40 may be determined as appropriate, but if it is too large, the effect of the hardness of the joint 40 on the feel will increase, and if it is too small, the joint area will be small and the materials will not be sufficiently bonded together. Therefore, in general, the area of each joint 40 is preferably about 0.14 to 3.5 mm 2.
  • the opening area of each through-hole 31 may be equal to or greater than the joint because the joint is formed through the through-hole 31, but is preferably about 1 to 1.5 times the area of the joint.
  • middle can also be formed.
  • the area and the area ratio of each joint 40 in each region are preferably set as follows.
  • Non-stretchable area Area of the joint 40: 0.14 to 3.5 mm2 (especially 0.25 to 1.0 mm2) Area ratio of the joint 40: 16 to 45% (especially 25 to 45%) (Main stretchable part) Area of the joint 40: 0.14 to 3.5 mm2 (especially 0.14 to 1.0 mm2) Area ratio of the joint 40: 1.8 to 19.1% (particularly 1.8 to 10.6%) (Transition expansion / contraction part) Area of the joint 40: 0.14 to 3.5 mm2 (especially 0.25 to 1.0 mm2) Area ratio of the joint 40: 8 to 22.5% (especially 12.5 to 22.5%)
  • the plane arrangement of the joints 40 and the through-holes 31 can be determined as appropriate, but a plane arrangement that is regularly repeated is preferable, such as an oblique lattice shape as shown in FIG. 18 (a) or as shown in FIG. 18 (b). Hexagonal lattice shape (these are also called staggered shapes), a square lattice shape as shown in FIG. 18 (c), a rectangular lattice shape as shown in FIG. 18 (d), and a parallel shape as shown in FIG. 18 (e). Body lattice (in the form shown in the figure, two groups are provided so that a large number of groups of parallel diagonal rows intersect each other), etc.
  • the group of joints 40 (in which these are inclined at an angle of less than 90 degrees with respect to the expansion / contraction direction)
  • group of joints 40 (group unit arrangement may be regular or irregular, and may be a pattern, a character shape, etc.) shall be regularly repeated. You can also.
  • the arrangement form of the joint portion 40 and the through-hole 31 may be the same in the main stretchable portion, the transition stretchable portion, and the non-stretchable region, or may be different.
  • the elastic film 30 is not particularly limited, and can be used without particular limitation as long as it is a resin film having its own elasticity.
  • a styrene-based elastomer, an olefin-based elastomer, a polyester-based elastomer, a polyamide-based elastomer, and a polyurethane-based film can be used.
  • a product obtained by processing one or two or more blends of thermoplastic elastomers such as elastomers into a film by extrusion molding such as a T-die method or an inflation method can be used.
  • the elastic film 30 the thing in which many holes and slits were formed for ventilation other than a non-porous thing can also be used.
  • the tensile strength in the stretching direction is 8 to 25 N / 35 mm
  • the tensile strength in the direction perpendicular to the stretching direction is 5 to 20 N / 35 mm
  • the tensile elongation in the stretching direction is 450 to 1050%
  • the direction perpendicular to the stretching direction is preferable.
  • the tensile strength and tensile elongation (breaking elongation) were determined according to JIS K7127 except that a tensile tester (for example, AOUTGRAPHAGS-G100N manufactured by SHIMADZU) was used and the test piece was rectangular with a width of 35 mm and a length of 80 mm.
  • a tensile tester for example, AOUTGRAPHAGS-G100N manufactured by SHIMADZU
  • the thickness of the elastic film 30 is not particularly limited, but is preferably about 20 to 40 ⁇ m.
  • the basis weight of the elastic film 30 is not particularly limited, but is preferably about 30 to 45 g / m 2, particularly preferably about 30 to 35 g / m 2.
  • Elongation rate means a value when the natural length is 100%.
  • Weight is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 20 ⁇ 5 ° C., relative humidity 65% or less) to obtain a constant weight. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%.
  • test and measurement shall be performed in a test room or equipment in a standard state (test location is temperature 20 ⁇ 5 ° C, relative humidity 65% or less). .
  • the stretchable sheet of the present invention can be used for a wide variety of absorbent articles having a stretchable structure, such as pants-type disposable diapers, various disposable diapers such as a tape type and a pad type, and sanitary napkins.
  • the stretchable sheet according to the present invention can be manufactured as a sheet constituting the back surface of the absorbent article while joining in the production line of the absorbent article.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Veterinary Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • Epidemiology (AREA)
  • Public Health (AREA)
  • Manufacturing & Machinery (AREA)
  • Nursing (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Laminated Bodies (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé de fabrication de feuille étirable, permettant de supprimer la striction. Le procédé selon l'invention comprend une étape d'acheminement destinée à interposer un film élastique étirable (30), dans un état allongé, entre une première couche de feuille (21) non étirable et une deuxième couche de feuille (22) non étirable. Pendant l'étape d'acheminement : de l'énergie de thermofusion est appliquée par un dispositif de thermofusion depuis l'extérieur de la première couche de feuille (21) et de la deuxième couche de feuille (22) sur des zones parties de liaison multiples comportant des espaces entre elles ; le film élastique (30) est fondu ; et la première couche de feuille (21) et la deuxième couche de feuille (22) sont reliées au niveau de la pluralité de parties de liaison, directement ou par le biais du film élastique (30) interposé entre elles. Le film élastique (30) est acheminé entre un rouleau opposé (63) et un rouleau pinceur (65), de sorte à entourer le rouleau opposé (63), puis il est acheminé en sorte à entourer un rouleau enclume (60). La vitesse périphérique du rouleau enclume (60) est supérieure à la vitesse périphérique du rouleau opposé (63), ce qui permet l'allongement du film élastique (30).
PCT/JP2017/024416 2016-08-19 2017-07-04 Procédé de fabrication de feuille étirable WO2018034069A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US16/324,287 US10869784B2 (en) 2016-08-19 2017-07-04 Method for manufacturing stretchable sheet
EP17841297.9A EP3501802B1 (fr) 2016-08-19 2017-07-04 Procédé de fabrication de feuille étirable

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016-161473 2016-08-19
JP2016161473A JP6454664B2 (ja) 2016-08-19 2016-08-19 伸縮シートの製造方法

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WO2018034069A1 true WO2018034069A1 (fr) 2018-02-22

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EP (1) EP3501802B1 (fr)
JP (1) JP6454664B2 (fr)
CN (1) CN107753184B (fr)
TW (1) TWI717546B (fr)
WO (1) WO2018034069A1 (fr)

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JP6240701B2 (ja) * 2016-03-30 2017-11-29 大王製紙株式会社 パンツタイプ使い捨ておむつ
JP6240733B1 (ja) * 2016-09-30 2017-11-29 大王製紙株式会社 使い捨て着用物品及びその製造方法
IT201700119053A1 (it) * 2017-10-20 2019-04-20 Fameccanica Data Spa Procedimento e apparecchio per produrre un nastro traspirante e relativo nastro
EP3703639B1 (fr) * 2017-10-31 2024-08-28 Kimberly-Clark Worldwide, Inc. Stratifiés élastiques présentant des parties élastiques incurvées
DE102019004372A1 (de) * 2019-06-19 2020-12-24 ontec automation GmbH Vorrichtung und Verfahren zum Ultraschallschweißverbinden von Fadengelegen
JP7505965B2 (ja) 2020-11-04 2024-06-25 花王株式会社 伸縮性複合シートの製造方法及び製造装置
EP4115861B1 (fr) * 2021-07-09 2024-09-18 The Procter & Gamble Company Appareils d'assemblage des stratifiés élastiques à l'aide d'un rouleau rotatif et d'une couche amovible
CN115320191A (zh) * 2022-08-22 2022-11-11 浙江华晨非织造布有限公司 一种多层复合型纵向弹性无纺布

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Also Published As

Publication number Publication date
US10869784B2 (en) 2020-12-22
EP3501802A1 (fr) 2019-06-26
TWI717546B (zh) 2021-02-01
CN107753184B (zh) 2021-03-19
US20190167487A1 (en) 2019-06-06
CN107753184A (zh) 2018-03-06
EP3501802B1 (fr) 2025-01-08
TW201808627A (zh) 2018-03-16
JP2018027672A (ja) 2018-02-22
JP6454664B2 (ja) 2019-01-16
EP3501802A4 (fr) 2020-04-01

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